pku acm 1005

#include <iostream>
#include <cmath>
using namespace std;

const float PI = 3.1515926;
const int AREA = 50;

int year(float x,float y)
{
	x = fabs(x);
	int k = 0;
	int area;//面积
	float r;//半径
	float dis = sqrt(pow(x,2)+pow(y,2));
	for(k = 1;; k++)
	{
		r = sqrt((k*AREA*2*1.0)/PI);
		if(r > dis)break;
	}
	return k;
}

int main()
{
	int count;
	float x,y;
	freopen("in.txt","r",stdin);
	cin>>count;

	int k = 1;
	while(k <= count)
	{
		cin>>x>>y;
		cout<<"Property "<<k<<": This property will begin eroding in year "<<year(x,y)<<"."<<endl;
		k++;
	}
	cout<<"END OF OUTPUT."<<endl;

    return 0; 
}

测试数据如下：

3
1.0 1.0
25.0 0.0
-25.0 0.0